The Ontario HVAC calendar: when to get your website and profile ready for furnace and AC season

Why timing matters for AI answers

Search engines and AI tools don't see a change the moment you make it. Pages have to be crawled and indexed, and Google's AI features documentation says a page must be indexed and eligible for a snippet to appear in AI Overviews or AI Mode. A furnace page you rewrite on the first cold night is late. The same page rewritten in September has a chance to be in the pool when the calls start.

The GTA's seasons, by the numbers

Environment and Climate Change Canada publishes climate normals for Toronto Pearson for 1991 to 2020. Heating degree-days (a measure of how much heating a building needs, counted below 18°C) show the shape of the heating season:

Month	Heating degree-days	Daily average
September	71.1	16.9°C
October	252.4	10.0°C
November	422.0	4.1°C
December	606.6	-1.6°C
January	711.1	-5.0°C
February	625.0	-4.4°C
March	538.3	0.6°C
April	328.8	7.0°C

Heating need roughly triples from September to October and keeps climbing to a January peak. Cooling degree-days (counted above 18°C) total 347.6 a year, about a tenth of the 3,751.3 heating degree-days, and are concentrated in July (129.5) and August.

What that means in practice:

• Furnace season is long. It runs from October into April, with the sharpest jump in October and November, when systems that sat idle all summer get switched on.
• AC season is short and spiky. Demand arrives with the first heat wave and is concentrated in a few weeks.
• Shoulder months matter. April, May and September are when homeowners plan replacements and heat pump upgrades rather than call for emergencies.

These are long-term averages, not a forecast. A warm November or an early June heat wave shifts the peaks. For search interest specifically, look at Google Trends for your main terms ("furnace repair", "AC repair", "heat pump") in Ontario over five years. It's free and shows your own market's curve.

The Toronto bylaw that drives landlord calls

The City of Toronto's indoor temperatures page says landlords must keep rental units at a minimum of 21°C from October 1 to May 15 each year. That's a change from older September 15 to June 1 dates you may still see quoted; the city amended them in 2024.

Since June 1, 2026, under Bill 1482, the bylaw is called Indoor Temperature Standards. It adds a cooling rule: where a cooling system is installed, it must be operated from June 1 to September 30 so the unit stays at no more than 26°C, and apartment buildings must keep at least one amenity space at 26°C or below over the same period.

For HVAC companies that serve landlords and property managers, those dates are deadlines. Expect heating service calls before October 1 and cooling calls before June 1, and say on your website that you work with rental properties if you do.

Rebates homeowners will ask about

Homeowners ask AI tools about rebates, and engines can only quote what's written somewhere. Make sure your site is current:

• Home Renovation Savings is offered by Enbridge Gas and Save on Energy with support from the Ontario government. Its heat pump page lists, for homes now heated with electricity, oil, propane or wood, up to $7,500 for a cold-climate air-source heat pump ($1,250 per ton) and up to $12,000 for ground-source ($2,000 per ton). Homes heated with natural gas are eligible for smaller amounts ($500 per ton up to $2,000 for cold-climate air-source). Pre-approval is required: the program says installations done before approval aren't eligible, and a participating contractor submits the applications.
• The Canada Greener Homes Grant is closed. Natural Resources Canada says applications ran from May 2021 to February 2024, and December 31, 2025 was the last day to upload documents.
• The Canada Greener Homes Loan is fully committed. NRCan's loan page says new applications can't be approved.

If your site still promotes the federal grant, fix it now. An AI answer that repeats an expired rebate from your page doesn't help your credibility. Rebate amounts change; check the program pages and date your rebate section.

A month-by-month plan

August and September: get ready for heating

• Update your furnace repair, furnace replacement and heat pump pages. Add the symptoms people describe when a furnace fails on its first start ("clicks but won't light", "burning smell when it turns on").
• Check your Business Profile hours, including any extended or emergency hours for the season, and set holiday hours for Thanksgiving.
• Post a tune-up update on your profile.
• Brief technicians on the review routine before the busy weeks.

October to January: peak heating

• Ask for reviews after every job. This is when most of your year's reviews can come in. See our review velocity guide.
• Reply to reviews weekly, even when busy.
• Keep hours accurate through the holidays (Christmas, Boxing Day, New Year's Day).
• Note the questions callers ask. They're next year's page content.

February to April: plan replacements

• Publish or refresh content on repair versus replace, heat pumps and rebates. Homeowners who limped through winter start planning now.
• Run the AI check in our guide to checking whether AI recommends you, using winter questions, to see who's being named.

April and May: get ready for cooling

• Update AC repair, AC installation and heat pump cooling pages.
• Set summer hours and holiday hours for Victoria Day and Canada Day.
• If you serve landlords, mention the June 1 cooling rule.

June to August: peak cooling

• Same routine as winter: reviews after every job, replies, accurate hours.
• Write down the questions. Cooling questions are often about noise, short cycling and whether a heat pump can replace an old AC.

One habit that covers all of it

Keep a short list of real homeowner questions for each season, in their words and with their neighbourhood. Ask them in ChatGPT, Gemini and Google before each peak and again after it. The answers show you which pages to fix next, and our guide to how homeowners ask AI for trades explains why those longer questions matter.